Name
Student Code
32nd IChO • Laboratory Task 1 Answer Sheet
10 points
Preparation of K3[Mn(C2O4)3] · xH2O
1. Thermometer reading in ice-water/0C:
2.
°C
Describe colour and crystal appearance of the product:
2-1. Is your product
violet
2-2.
brown
2-3.
grey
2-4.
colourless (white)
2-5.
pink
2-6.
red
3-1. Is your product
needles
3-2.
a powder
3-3.
irregular lumps
3-4.
flakes
3-5.
an oil
3.
Lab. ass. initials
Final version 06/03/16-12:48
1 of 7
Name
Student Code
32nd IChO • Laboratory Task 1
Answer Sheet
Mass of vial with product/g: ________________
Lab. ass. initials
Mass of empty vial
(including lid and label) /g: ________________
Lab. ass. initials
10 points
1-A Practical yield/g:
1-B Suggested molecular formula of the white precipitate:
Penalty!
Additional portion of compound received
Student’s initials
Lab. assistant’s init
06/03/16-12:48
2 of 7
Name
Student Code
32nd IChO • Laboratory Task 1
Answer Sheet
10 points
Analysis of K3[Mn(C2O4)3] · xH2O for oxidizing ability
Batch number of the provided sample: ______
Concentration of standard Na2S2O3/mol L-1: _________________
Colour of the label (circle one): white
Titration number
light grey
1
2
dark grey
3
Sample No. (see label)
Mass of sample m/g
Final burette reading /mL
Initial burette reading/mL
Volume of Na2S2O3, V/mL
Molar mass/g mol-1:
Show the calculation for one titration:
1-C
Molar mass/g mol-1:
Penalty!
Additional portion of compound received
Student’s initials
Lab. assistant’s init
06/03/16-12:48
3 of 7
Name
Student Code
32nd IChO • Laboratory Task 2 Answer Sheet
10 points
Analysis of K3[Mn(C2O4)3] · xH2O for reducing ability
Batch number of the provided sample: ______
Concentration of standard KMnO4/mol L-1:
Colour of the label (circle one): yellow
Titration number
Sample No. (see label)
1
__________________
red
blue
2
3

Mass of sample, m/g
Final burette reading/mL
Initial burette reading/mL
Volume of KMnO4, V/mL
Molar mass/g mol-1:
Show the calculation for one titration:
1-D Molar mass/g mol-1
1-E Calculate the value of x in the formula K3[Mn(C2O4)3]· xH2O and the yield of
your preparation in percent of the theoretical yield
Penalty!
Additional portion of compound received
Student’s initials
Lab. assistant’s init
Final version 06/03/16-12:48
4 of 7
Name
Student Code
32nd IChO • Laboratory Task 2
Answer Sheet
10 points
Synthesis of Amino Acid Methyl Ester Hydrochloride
Mass of serine. Sample No. (see label)
1.
Record the following data:
Mass of tube with product/g: ________________
Lab. ass. initials
Mass of empty tube including lid/g: ________________
Lab. ass. initials
1-1. The mass of your product:
1-2. The calculated theoretical yield:
1-3. The yield obtained as a percentage of the theoretical:
2.
Describe colour and crystal appearance of the product:
2-1. Is your product
yellowish
2-2.
greyish or brownish
2-3.
white
3-1. Is your product
needles
3-2.
a powder
3-3.
irregular lumps
3-4.
flakes
3-5.
an oil
3.
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Name
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32nd IChO • Laboratory Task 2
4.
Answer Sheet
10 points
Which of the following is the IUPAC name of the product ?
4-1. 1-Hydroxy-2-aminopropanoic acid methyl ester hydrochloride
4-2. Methyl-2-amino-3-hydroxypropanoate hydrochloride
4-3. Methyl serinate hydrochloride
4-4. Hydroxymethylaminoacetic acid methyl ester hydrochloride
5.
Write the equation for the reaction between thionyl chloride and methanol

6.
Which of the products from this reaction will catalyze the ester formation?

7. What will be the approximate pH of a saturated aqueous solution of the product,
if pure ? Mark with an X.
1
8.
4
7
10
Indicate by means of a cross in the appropriate box which is the best way to
dispose of 5 mL of thionyl chloride:
8-1. Pour into the sink and flush with plenty of water.
8-2. Pour it directly into the container for inorganic chemical waste.
8-3. Pour it slowly into diluted aqueous ammonia and then into the waste
container.
8-4. Pour diluted aqueous ammonia into it and then pour the mixture into the
waste container.
06/03/16-12:48
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Name
Student Code
32nd IChO • Laboratory Task 2
Answer Sheet
10 points
In the procedure, tert.-butyl methyl ether is used instead of diethyl ether.
9.
Indicate by means of a cross in the appropriate box which one of the following
statements is WRONG:
9-1 Diethyl ether and tert.-butyl methyl ether have similar solubility
characteristics
9-2. Diethyl ether has a lower boiling point than tert.-butyl methyl ether
9-3. Diethyl ether has a higher flash point (higher ignition temperature) than
tert.-butyl methyl ether
9-4. tert.-Butyl methyl ether is less soluble in water than diethyl ether
Penalty!
Additional portion of serine
received
06/03/16-12:48
Student’s initials
Lab. assistant’s init.
7 of 7